while we're at it, lets raise STR requirements on 2h weapons and polearms not to mention plate armor
30 STR requirement on black armor, great/long maul, flameberge, bardiches, etc
27 STR requirement for danish/german, poleaxes, great axes, mallet, gothic/milanese plate
now you might see how ridiculous your idea is. Horses are easy and simple to counter, get any of the following: a pointy stick, 2h sword over 115 length, xbow/archery/throwing.